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Department of Oncology (M.B.M., G.E.S., M.S.M., S.E.O., A.S.), Lombardi Cancer Center, Georgetown University, Washington, DC 20007; Department of Biochemistry and Molecular Biology (M.B.M., A.S.), Lombardi Cancer Center, Georgetown University, Washington, DC 20007; Department of Pharmacology (T.F.F.), Columbia University, New York 10032; Institut de Genetique et de Biologie Moleculaire et Cellulaire (P.C.), CNRS/INSERM/ULP, College de France, BP 163 163,67404 Illkirch Cedex, France; Department of Molecular and Integrative Physiology (B.S.K.), University of Illinois, Urbana, Illinois 61801; and Department of Neuroscience (B.S.), Georgetown University, Washington, DC 20007
Address all correspondence and requests for reprints to: Adriana Stoica, Lombardi Cancer Center, E411 Research Building, 3970 Reservoir Road NW, Washington, DC 20007. E-mail: stoicaa{at}gunet.georgetown.edu
This study examines whether the serine/threonine protein kinase, Akt,
is involved in the cross-talk between epidermal growth factor (EGF) and
insulin-related growth factor I (IGF-I) receptors and ER-
. Treatment
of MCF-7 cells with either EGF or IGF-I resulted in a rapid
phosphorylation of Akt and a 14- to 16-fold increase in Akt activity,
respectively. Akt activation was blocked by inhibitors of
phosphatidylinositol 3-kinase, but not by an inhibitor of the ribosomal
protein kinase p70S6K. Stable transfection of cells with a
dominant negative Akt mutant blocked the effects of EGF and IGF-I on
ER-
expression and activity, whereas stable transfection of cells
with a constitutively active Akt mutant mimicked the effects of EGF and
IGF-I. In the latter cells, there was a decrease in the amount of
ER-
protein and messenger RNA (7080%) and an increase in the
amount of progesterone receptor protein, messenger RNA (4- to 9- and by
3.5- to 7-fold, respectively) and pS2 (3- to 5-fold). Coexpression of
wild-type ER-
and the dominant negative Akt mutant in COS-1 cells
also blocked the growth factor-stimulated activation of ER-
, but
coexpression of the wild-type receptor with the constitutively active
Akt mutant increased ER-
activity. Receptor activation was blocked
by an antiestrogen. Studies using mutants of ER-
demonstrated that
Akt increased estrogen receptor activity through the amino-terminal
activation function-1 (AF-1). Serines S104 S106, S118, and S167 appear
to play a role in the activation of ER-
by Akt.
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M. Esfandiarei, H. Luo, B. Yanagawa, A. Suarez, D. Dabiri, J. Zhang, and B. M. McManus Protein Kinase B/Akt Regulates Coxsackievirus B3 Replication through a Mechanism Which Is Not Caspase Dependent J. Virol., April 15, 2004; 78(8): 4289 - 4298. [Abstract] [Full Text] [PDF] |
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J. D. Blaustein Minireview: Neuronal Steroid Hormone Receptors: They're Not Just for Hormones Anymore Endocrinology, March 1, 2004; 145(3): 1075 - 1081. [Abstract] [Full Text] [PDF] |
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A. Argiris, C.-X. Wang, S. G. Whalen, and M. P. DiGiovanna Synergistic Interactions between Tamoxifen and Trastuzumab (Herceptin) Clin. Cancer Res., February 15, 2004; 10(4): 1409 - 1420. [Abstract] [Full Text] [PDF] |
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C. S. Watson and B. Gametchu Proteins of Multiple Classes May Participate in Nongenomic Steroid Actions Experimental Biology and Medicine, December 1, 2003; 228(11): 1272 - 1281. [Abstract] [Full Text] [PDF] |
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Q. Cai, X.-O. Shu, F. Jin, Q. Dai, W. Wen, J.-R. Cheng, Y.-T. Gao, and W. Zheng Genetic Polymorphisms in the Estrogen Receptor {alpha} Gene and Risk of Breast Cancer: Results from the Shanghai Breast Cancer Study Cancer Epidemiol. Biomarkers Prev., September 1, 2003; 12(9): 853 - 859. [Abstract] [Full Text] [PDF] |
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L.-A. Martin, I. Farmer, S. R. D. Johnston, S. Ali, C. Marshall, and M. Dowsett Enhanced Estrogen Receptor (ER) {alpha}, ERBB2, and MAPK Signal Transduction Pathways Operate during the Adaptation of MCF-7 Cells to Long Term Estrogen Deprivation J. Biol. Chem., August 15, 2003; 278(33): 30458 - 30468. [Abstract] [Full Text] [PDF] |
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J. Faridi, L. Wang, G. Endemann, and R. A. Roth Expression of Constitutively Active Akt-3 in MCF-7 Breast Cancer Cells Reverses the Estrogen and Tamoxifen Responsivity of these Cells in Vivo Clin. Cancer Res., August 1, 2003; 9(8): 2933 - 2939. [Abstract] [Full Text] [PDF] |
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G. E. Stoica, T. F. Franke, A. Wellstein, F. Czubayko, H.-J. List, R. Reiter, E. Morgan, M. B. Martin, and A. Stoica Estradiol Rapidly Activates Akt via the ErbB2 Signaling Pathway Mol. Endocrinol., May 1, 2003; 17(5): 818 - 830. [Abstract] [Full Text] [PDF] |
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X. Cui, P. Zhang, W. Deng, S. Oesterreich, Y. Lu, G. B. Mills, and A. V. Lee Insulin-Like Growth Factor-I Inhibits Progesterone Receptor Expression in Breast Cancer Cells via the Phosphatidylinositol 3-Kinase/Akt/Mammalian Target of Rapamycin Pathway: Progesterone Receptor as a Potential Indicator of Growth Factor Activity in Breast Cancer Mol. Endocrinol., April 1, 2003; 17(4): 575 - 588. [Abstract] [Full Text] [PDF] |
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E. R. Levin Bidirectional Signaling between the Estrogen Receptor and the Epidermal Growth Factor Receptor Mol. Endocrinol., March 1, 2003; 17(3): 309 - 317. [Abstract] [Full Text] [PDF] |
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M. Razandi, A. Pedram, S. T. Park, and E. R. Levin Proximal Events in Signaling by Plasma Membrane Estrogen Receptors J. Biol. Chem., January 17, 2003; 278(4): 2701 - 2712. [Abstract] [Full Text] [PDF] |
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H. Kurokawa and C. L. Arteaga ErbB (HER) Receptors Can Abrogate Antiestrogen Action in Human Breast Cancer by Multiple Signaling Mechanisms Clin. Cancer Res., January 1, 2003; 9(1): 511S - 515S. [Abstract] [Full Text] [PDF] |
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K. J. Ho and J. K. Liao Nonnuclear Actions of Estrogen Arterioscler. Thromb. Vasc. Biol., December 1, 2002; 22(12): 1952 - 1961. [Abstract] [Full Text] [PDF] |
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J.-L. Merlin, M. Barberi-Heyob, and N. Bachmann In vitro comparative evaluation of trastuzumab (Herceptin(R)) combined with paclitaxel (Taxol(R)) or docetaxel (Taxotere(R)) in HER2-expressing human breast cancer cell lines Ann. Onc., November 1, 2002; 13(11): 1743 - 1748. [Abstract] [Full Text] [PDF] |
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D. M. Brownson, N. G. Azios, B. K. Fuqua, S. F. Dharmawardhane, and T. J. Mabry Flavonoid Effects Relevant to Cancer J. Nutr., November 1, 2002; 132(11): 3482S - 3489. [Abstract] [Full Text] [PDF] |
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D. M. Klotz, S. C. Hewitt, P. Ciana, M. Raviscioni, J. K. Lindzey, J. Foley, A. Maggi, R. P. DiAugustine, and K. S. Korach Requirement of Estrogen Receptor-alpha in Insulin-like Growth Factor-1 (IGF-1)-induced Uterine Responses and in Vivo Evidence for IGF-1/Estrogen Receptor Cross-talk J. Biol. Chem., March 1, 2002; 277(10): 8531 - 8537. [Abstract] [Full Text] [PDF] |
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S. Oesterreich, P. Zhang, R. L. Guler, X. Sun, E. M. Curran, W. V. Welshons, C. K. Osborne, and A. V. Lee Re-expression of Estrogen Receptor {alpha} in Estrogen Receptor {alpha}-negative MCF-7 Cells Restores both Estrogen and Insulin-like Growth Factor-mediated Signaling and Growth Cancer Res., August 1, 2001; 61(15): 5771 - 5777. [Abstract] [Full Text] [PDF] |
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M. Sun, J. E. Paciga, R. I. Feldman, Z.-q. Yuan, D. Coppola, Y. Y. Lu, S. A. Shelley, S. V. Nicosia, and J. Q. Cheng Phosphatidylinositol-3-OH Kinase (PI3K)/AKT2, Activated in Breast Cancer, Regulates and Is Induced by Estrogen Receptor {alpha} (ER{alpha}) via Interaction between ER{alpha} and PI3K Cancer Res., August 1, 2001; 61(16): 5985 - 5991. [Abstract] [Full Text] [PDF] |
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